US8076325B2 - 1,2,4,5-tetrahydro-3H-benzazepine compounds, a process for their preparation and pharmaceutical compositions containing them - Google Patents

1,2,4,5-tetrahydro-3H-benzazepine compounds, a process for their preparation and pharmaceutical compositions containing them Download PDF

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US8076325B2
US8076325B2 US12/283,110 US28311008A US8076325B2 US 8076325 B2 US8076325 B2 US 8076325B2 US 28311008 A US28311008 A US 28311008A US 8076325 B2 US8076325 B2 US 8076325B2
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methyl
octa
trien
dimethoxy
tetrahydro
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Jean-Louis Peglion
Bertrand Goument
Aimee Dessinges
Pascal Caignard
Jean-Paul Vilaine
Catherine Thollon
Nicole Villeneuve
Stefano Chimenti
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Laboratoires Servier SAS
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
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    • C07D223/14—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
    • C07D223/16—Benzazepines; Hydrogenated benzazepines
    • A—HUMAN NECESSITIES
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Definitions

  • the present invention relates to new 1,2,4,5-tetrahydro-3H-benzazepine compounds, to a process for their preparation and to pharmaceutical compositions containing them.
  • the compounds of the invention block HCN (hyperpolarisation-activated cyclic nucleotide-gated) channels.
  • HCN channels caused by the compounds of the invention allows the latter to be used in curative and preventative treatments for any pathology in which the activity or expression of HCN channels is degraded and abnormal.
  • Said compounds of the invention may especially be useful in the curative or preventative treatment of pain, in particular neuropathic and inflammatory pain (Chaplan S R, Guo H Q, Lee D H, Luo L, Liu C, Kuei C, Velumian A A, Butler M P, Brown S M, Dubin A E. Neuronal hyperpolarization - activated pacemaker channels drive neuropathic pain. J Neurosci 2003; 23(4):1169-78; Luo L, Chang L, Brown S M, Ao H, Lee D H, Higuera E S, Dubin A E, Chaplan S R. Role of peripheral hyperpolarization - activated cyclic nucleotide - modulated channel pacemaker channels in acute and chronic pain models in the rat.
  • the compounds of the invention reduce cardiac pacemaker activity in direct and selective manner.
  • the selective reduction of heart rate caused by the compounds of the invention makes it possible for the latter to be used curatively or preventatively in the various pathologies in which accelerated heart rate acts as a trigger or has an aggravating role.
  • Said compounds may especially improve the treatment and long-term prognosis of ischaemic cardiopathies (Dyer A R, Persky V, Stamler J, and al. Heart rate as a prognostic factor for coronary heart disease and mortality: findings in three Chicago epidemiologic studies. Am J Epidemiol. 1980; 112: 736-749; Kannel W B, Kannel C, Paffengarger R S Jr, and al. Heart rate and cardiovascular mortality: the Framingham Study. Am Heart J.
  • Lucci D, Marini M, Baldasseroni S, Maggioni A P In - hospital and one - year outcomes of patients with high - risk acute myocardial infarction treated with thrombolysis or primary coronary angioplasty. Ital Heart J 2004; 5:136-145; Mauss O, Klingenlander T, Ptaszynski P, Hohnloser S H: Bedside risk stratification after acute myocardial infarction: prospective evaluation of the use of heart rate and left ventricular function.
  • the problem for the present invention was to obtain new compounds which reduce heart rate, which are simultaneously potent, selective and safe to use.
  • One aspect of the present invention relates to compounds of formula (I) wherein R 1 represents a hydrogen atom or a linear or branched C 1 -C 6 alkyl group, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • R 1 represents a C 3 -C 7 cycloalkyl group or a cycloalkylalkyl group wherein the cycloalkyl moiety contains from 3 to 7 carbon atoms and the alkyl moiety contains from 1 to 6 carbon atoms and is linear or branched, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • R 2 , R 3 , R 4 and R 5 which may be the same or different, each represent a hydrogen atom or a linear or branched, saturated or unsaturated C 1 -C 6 alkoxy group or —OCOR 10 wherein R 10 represents a group NR 11 R′ 11 as defined hereinbefore, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • R 11 and R′ 11 each represent a linear or branched C 1 -C 6 alkyl group.
  • R 6 , R 7 , R 8 and R 9 which may be the same or different, each represent a hydrogen atom or a linear or branched, saturated or unsaturated C 1 -C 6 alkoxy group, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • Another aspect of the invention relates to compounds of formula (I) wherein m represents 0, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • Another aspect of the invention relates to compounds of formula (I) wherein m represents 1 and X represents CH 2 , to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • Another aspect of the invention relates to compounds of formula (I) wherein p represents 0, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • Another aspect of the invention relates to compounds of formula (I) wherein p represents 1, to their optical isomers when they exist, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • R 1 represents a hydrogen atom or a linear or branched C 1 -C 6 alkyl group
  • R 2 , R 3 , R 4 and R 5 which may be the same or different, each represent a hydrogen atom or a linear or branched, saturated or unsaturated C 1 -C 6 alkoxy group
  • R 6 , R 7 , R 8 and R 9 which may be the same or different, each represent a hydrogen atom or a linear or branched, saturated or unsaturated C 1 -C 6 alkoxy group
  • m represents 0, n represents 1 and p represents 0, to their optical isomers, and also to addition salts thereof with a pharmaceutically acceptable acid.
  • Another aspect of the invention relates to the following compounds:
  • the present invention relates also to a process for the preparation of compounds of formula (I), starting from a compound of formula (II):
  • R 6 , R 7 , R 8 and R 9 are as defined for formula (I),
  • R 6 , R 7 , R 8 and R 9 are as defined hereinbefore,
  • R 6 , R 7 , R 8 and R 9 are as defined hereinbefore,
  • optically active forms of the compounds of formula (I) are obtained, either by starting from optically active forms of the synthesis intermediates of formulae (VI) and (VIII) or by resolving racemic forms of the compounds of formula (I), in accordance with methods known from the literature.
  • the compounds of the invention block HCN (hyperpolarisation-activated cyclic nucleotide-gated) channels.
  • HCN channels caused by the compounds of the invention allows the latter to be used in curative or preventative treatments for any pathology in which the activity or expression of HCN channels is degraded and abnormal.
  • Said compounds of the invention may especially be useful in the curative or preventative treatment of pain, in particular neuropathic and inflammatory pain, bladder overactivity, and eye dryness sensations.
  • the compounds of the invention reduce cardiac pacemaker activity in direct and selective manner.
  • the selective reduction of heart rate caused by the compounds of the invention makes it possible for the latter to be used curatively or preventatively in the various pathologies in which accelerated heart rate acts as a trigger or has an aggravating role.
  • Said compounds may especially improve the treatment and long-term prognosis of ischaemic cardiopathies in their various clinical manifestations: stable angina, acute coronary syndromes: unstable angina, threat syndromes and myocardial infarction, post infarction; heart failure whether systolic or diastolic and whether in the chronic or acute forms thereof; ventricular or supraventricular rhythm disturbances, pathologies constituting a vascular risk factor: arterial hypertension, diabetes, hypercholesterolaemia, especially by reducing endothelial dysfunction, the development of atherosclerosis lesions and their complications.
  • Said compounds may make it possible to ensure myocardial protection in patients at risk, in the course of surgery or during septic shock.
  • Reducing heart rate may moreover form part of the treatment of diseases such as hyperthyroidism accompanied by sinus tachycardia.
  • the present invention relates also to pharmaceutical compositions comprising as active ingredient a compound of formula I, or an addition salt thereof with a pharmaceutically acceptable acid, in combination with one or more pharmaceutically acceptable, inert, non-toxic excipients or carriers.
  • compositions according to the invention there may be mentioned more especially those that are suitable for oral, parenteral (intravenous, intramuscular or subcutaneous), per- or trans-cutaneous, nasal, rectal, perlingual, ocular or respiratory administration, and especially tablets or dragees, sublingual tablets, hard gelatin capsules, capsules, suppositories, creams, ointments, dermal gels, injectable or drinkable preparations, aerosols, eye drops and nose drops.
  • compositions according to the invention comprise one or more excipients or carriers such as diluents, lubricants, binders, disintegrating agents, absorbents, colourants, sweeteners.
  • the percentage of active ingredient of formula (I) in the pharmaceutical composition is preferably from 5% to 50% by weight.
  • the useful dosage varies according to the age and weight of the patient, the administration route, the nature and severity of the disorder, and the administration of any associated treatments and ranges from 0.5 mg to 500 mg per day in one or more administrations.
  • the preceding compound is dissolved in 1400 mL of acetic acid. 68 g (1.04 moles/2.7 eq.) of powdered zinc are added all at once. An exotherm to 58° C. develops slowly. After 1 hour in contact, the reaction mixture is poured onto 3 kg of ice. The aqueous phase obtained is extracted with 1 liter and then 500 mL of toluene. The combined toluene phases are washed with aqueous saturated sodium chloride solution. After concentration, the residue is chromatographed over silica to yield the desired product.
  • Step 5 2-(2-Bromobicyclo[4.2.0]octa-1,3,5-trien -7-yl)-4,4-dimethyl-4,5-dihydrooxazole
  • Step 6 [7-(4,4-Dimethyl-4,5-dihydro-1,3-oxazol-2-yl)bicyclo[4.2.0]octa-1,3,5-trien-2-yl-(diphenylmethylene)amine
  • Step 7 2-Aminobicyclo[4.2.0]octa-1,3,5-triene-7-carboxylic acid ethyl ester
  • Step 8 2-Hydroxybicyclo[4.2.0]octa-1,3,5-triene-7-carboxylic acid
  • Step 9 2-Methoxybicyclo[4.2.0]octa-1,3,5-triene-7-carboxylic acid ethyl ester
  • the residue (0.99 g) is chromatographed on a column of 50 g of silica (eluant: dichloromethane/ethanol/ammonia: 95/5/0.5) to yield a first fraction of the desired product and another fraction of the same product in the form of boron complexes. That latter fraction, after treatment with ethanolic HCl, and then acid-base extraction, provides an additional fraction of the desired product.
  • silica eluant: dichloromethane/ethanol/ammonia: 95/5/0.5
  • the oil is purified by flash chromatography over 100 g of silica (eluant: CH 2 Cl 2 100%) to yield the expected product, which crystallises at ambient temperature.
  • Step 1 Ethyl(5,6-Dihydrocyclobuta[4,5]benzo[1,2-d][1,3]dioxol-5-yl-methyl)carbamate
  • Step 1 ⁇ [(7S)-3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ cyclopropane-carboxamide
  • the mixture is then stirred at ambient temperature for 1 hour 30 minutes and is then transferred to a separating funnel; 60 mL of dichloromethane are added and successive washing with 40 mL of water, two 40 mL quantities of 1N hydrochloric acid, two 40 mL quantities of saturated aqueous sodium hydrogen carbonate solution and 40 mL of water are carried out. After drying over magnesium sulphate, filtration and concentration, the desired product is collected.
  • Step 2 (Cyclopropylmethyl) ⁇ [(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]-methyl ⁇ -amine
  • Step 1 ⁇ N-([(7S)-3, 4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]-methyl ⁇ -2,2,2-trifluoroacetamide
  • the residue is taken up in 100 mL of dichloromethane, and washing with 50 mL of 1N hydrochloric acid and then 50 mL of water and drying over magnesium sulphate are carried out. After filtration and concentration, the desired product is collected.
  • Step 2 N- ⁇ [(7S)-3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]-methyl ⁇ -2,2,2-trifluoroethanamine
  • Step 1 7-Cyanobicyclo[4.2.0]octa-1,3,5-trien-3-yl trifluoromethanesulphonate
  • Step 1 [ ⁇ [(7S)-3, 4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ (methyl)amino]acetonitrile.
  • Step 2 N- ⁇ [(7S)-3, 4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ -N-methyl-ethane-1,2-diamine
  • a solution of 1.1 g (4.5 mmol) of the compound of Step 1 in 10 mL of THF is poured dropwise into 0.21 g (5.4 mmol) lithium aluminium hydride suspended in 5 mL of THF, at ambient temperature, and is then stirred at ambient temperature for 5 hours. Cooling to about 0° C. is carried out and there are then added, cautiously, in succession, 0.14 mL of water, 0.11 mL of 20% aqueous sodium hydroxide solution and 0.51 mL of water. Stirring is carried out overnight at ambient temperature, and then the salts are filtered off over a frit and rinsed with THF. The combined filtrates are concentrated to yield the desired product.
  • Step 4 N-[(3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]-3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-methyl-3-oxopropan-1amine hydrochloride
  • the expected product is obtained by converting N- ⁇ [(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5trien-7-yl]methyl ⁇ -3(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-methyl-3-oxopropan-1-amine, obtained by returning the hydrochloride obtained in Example 3a to the base, to a salt using fumaric acid.
  • the expected product is obtained by converting N- ⁇ [(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ -3(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-methyl-3-oxopropan-1-amine, obtained by returning the hydrochloride obtained in Example 3a to the base, to a salt using pamoic acid.
  • the expected product is obtained by converting N- ⁇ [(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ -3(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-methyl-3-oxopropan-1-amine, obtained by returning the hydrochloride obtained in Example 3a to the base, to a salt using 1,5-naphthalenedisulphonic acid.
  • Step 1 N-Benzyl-3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropan-1amine
  • Step 2 N-Benzyl-N-[(5,6-dimethoxy-2,3-dihydro-1H-inden-2-yl)methyl]-3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropan-1-amine
  • Step 3 N-[2-(5,6-Dimethoxy-2,3-dihydro-1H-inden-2-yl)methyl]-3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropan-1-amine hydrochloride
  • the residue is chromatographed over 500 g of silica (eluant:dichloromethane/ethanol/ammonia 95/5/0.5) to yield the expected product in the form of the base.
  • 1 g of the pure base is made more solid in 9 mL of ethanol and is then converted into a salt using 1.1 eq. of 2N ethereal HCl in 9 mL of acetonitrile and is then finally recrystallised from a mixture of ethanol (27 mL) and of water (4 mL) to yield, after filtration and drying, the expected product in the form of the hydrochloride.
  • Step 1 4-(7,8-Dimethoxy 1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-4-oxobutan-1-ol
  • Step 3 N- ⁇ [(7S)-3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ -3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-methyl-4-oxobutan-1-amine hydrochloride
  • Example 47 1.9 g of the compound of Example 47 is separated by chromatography on a chiral phase; mobile phase: MeOH/DEA: 1000/1.
  • the first product eluted corresponds to the expected product, which is converted into a salt using 3N ethanolic HCl.
  • Example 48 The second product eluted in Example 48 corresponds to the expected product, which is converted into a salt under the same conditions as the product of Example 48.
  • the residue (0.96 g) is chromatographed over 130 g of silica (eluant: dichloromethane/ethanol/ammonia 95/5/0.5) to yield the expected product in the form of a base, which when dissolved in 9 mL of ethanol and treated with 0.65 mL of 3N ethanolic HCl yields the hydrochloride.
  • silica eluant: dichloromethane/ethanol/ammonia 95/5/0.5
  • Step 1 tert-Butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl-3-oxopropyl]-[(4-hydroxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]carbamate
  • Step 2 8-( ⁇ (tert-Butoxycarbonyl-[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl) methylcarbamate
  • Step 3 8- ⁇ [[3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-amino]methyl ⁇ bicyclo[4.2.0]octa-1,3,5-trien-3-yl methylcarbamate hydrochloride
  • Step 1 8-( ⁇ (tert-Butoxycarbonyl-[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl) dimethylcarbamate
  • Step 2 8- ⁇ [[3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-amino]methyl ⁇ bicyclo[4.2.0]octa-1,3,5-trien-3-yl dimethylcarbamate hydrochloride
  • Step 1 7-( ⁇ (tert-Butoxycarbonyl-[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl) dimethylcarbamate
  • Step 2 7- ⁇ [[3(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino]methyl ⁇ bicyclo[4.2.0]octa-1,3,5-trien-3-yl dimethylcarbamate hydrochloride
  • Step 1 0.8 g (1.37 mmoles) of the product obtained in Step 1 is dissolved in 4 mL of ethanol and 2 mL of 3.2N ethanolic HCl are added. Heating is carried out at 60° C. for 2 hours. The mixture is allowed to cool to ambient temperature and stirring is carried out for 2 hours. A solid is filtered off, which is recrystallised from 6 mL of ethanol at reflux. The mixture is allowed to crystallise at 25° C., filtered and dried. The expected product is obtained in the form of a white solid.
  • Step 1 8-( ⁇ (tert-Butoxycarbonyl-[3-(7, 8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl) ethylcarbonate
  • Example 51 Obtained as for the synthesis of Example 51, but with replacement of the product of Example 43 by the tert-butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl][(4-hydroxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]carbamate obtained in Step 1 of Example 52.
  • Step 2 8- ⁇ [[3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino]methyl ⁇ bicyclo[4.2.0]octa-1,3,5-trien-3-yl ethylcarbonate hydrochloride
  • Step 1 8-( ⁇ (tert-Butoxycarbonyl-[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl) acetate
  • Step 2 8- ⁇ [[3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino]methyl ⁇ bicyclo[4.2.0]octa-1,3,5-trien-3-yl acetate hydrochloride
  • Step 1 7-( ⁇ (tert-Butoxycarbonyl)-[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl hexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate
  • Step 2 7-( ⁇ [3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl hexahydrocyclopenta[c]pyrrole-2(1H)-carboxylate (cis compound)
  • Step 1 The product obtained in Step 1 is dissolved in 10 volumes of ethanol and 10 volumes of 3N ethanolic HCl solution. Stirring is carried out at ambient temperature for 24 hours and the precipitate obtained, which corresponds to the expected product, is filtered off.
  • Step 1 tert-Butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-[(3-hydroxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]carbamate
  • Example 35 3.6 g (8.8 mmoles) of the product of Example 35 are dissolved in 60 mL of dichloromethane. There are then added 2.1 g (1.1 equivalents) of di-tert-butyl dicarbonate and stirring is carried out at ambient temperature for 3 hours (until no more gas is evolved). The dichloromethane is evaporated off, drying in a vane pump vacuum is carried out and the expected product is obtained.
  • Step 2 tert-Butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-[(3-isopropoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]carbamate
  • Step 3 3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N-[(3-isopropoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methyl]-3-oxopropan-1-amine hemifumarate
  • Step 2 2- ⁇ [(3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)-methyl]-(methyl)-amino ⁇ ethyl 7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepine-3-carboxylate
  • reaction mixture is rendered basic with 10 mL of 1N sodium hydroxide solution and stirring is carried out for half an hour.
  • the phases are separated, the aqueous phase is extracted twice with ethyl acetate, the organic phases are combined, washed with water and then with saturated NaCl solution and dried over MgSO 4 .
  • a residue is isolated which is chromatographed over silica (eluant: CH 2 Cl 2 /EtOH/NH 4 OH 95/5/0.5) to yield the expected compound, which is converted into its hydrochloride using 2N ethereal HCl solution.
  • Step A tert-Butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl][3-hydroxybicyclo[4.2.0]octa-1,3,5-trien 7-yl)methyl]carbamate
  • Step B 3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-N- ⁇ [3-(3-methoxypropoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl ⁇ -3-oxopropan-1-amine hydrochloride
  • Step A ([7-( ⁇ (tert-Butoxycarbonyl)[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl)oxy]carboxylic acid ethyl ester
  • Step B tert-Butyl[3-(7,8-dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-( ⁇ 3-[2-(methylamino)2-oxoethoxy]bicyclo[4.2.0]octa-1,3,5-trien-7-yl ⁇ methyl)-carbamate
  • Step C 2- ⁇ [7-( ⁇ [3-(7,8-Dimethoxy-1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-3-oxopropyl]-amino ⁇ methyl)bicyclo[4.2.0]octa-1,3,5-trien-3-yl]oxy ⁇ -N-methylacetamide hydrochloride
  • the base is dissolved in 4 mL of ethanol and treated with 0.3 mL of 3.7N ethanolic HCl. After stirring for 1 hour at ambient temperature, the solid formed is filtered off, rinsed with ethanol and dried in vacuo to obtain the desired compound in the form of the hydrochloride.
  • the right atrium (RA), which beats spontaneously, is isolated, placed in a basin, thermostatically controlled at 35° C., containing 20 ml of physiological solution and connected to an isometric tension sensor (model IT-25, EMKA Technologies, Paris, France). The initial tension is set at 0.4 g.
  • the spontaneous beating rate is measured by IOX software (EMKA Technologies, Paris, France). Preparations whose spontaneous beating rate is not between 200 and 300 beats per minute are excluded.
  • the compounds are dissolved daily at 10 ⁇ 2 M.
  • the following dilutions are stored in ice over the duration of the experiment.
  • the compound under test is added to the medium in cumulative manner every 15 minutes (4 concentrations).
  • concentrations are expressed as a percentage relative to the initial rate.
  • concentration that reduces the initial beating rate by 30% is calculated and expressed in terms of molarity ( ⁇ M).
  • Example 3a 1.3
  • Example 4 1.4
  • Example 7 1.7
  • Example 14 1
  • Example 22 0.8
  • Example 23 1.4
  • Example 27 1.2
  • Example 28 1.2
  • Example 29 0.4
  • Example 34 1.3
  • Example 44 0.8
  • Example 46 0.5
  • Example 47 0.6
  • Example 48 0.5
  • Example 50 0.5
  • Example 53 1.8
  • Example 54 0.8
  • Example 71 1.8
  • Example 73 2.4
  • Example 74 1.0
  • Example 76 1.6
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WO2015009534A2 (en) 2013-07-16 2015-01-22 Allergan, Inc. Hcn inhibitors affecting ganglion cell function and visual function
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FR2984320B1 (fr) * 2011-12-20 2013-11-29 Servier Lab Nouveau procede de synthese de l'ivabradine et de ses sels d'addition a un acide pharmaceutiquement acceptable
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FR3020810B1 (fr) * 2014-05-06 2016-05-06 Servier Lab Nouveau sel de l'ivabradine et son procede de preparation.
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US20230140818A1 (en) * 2017-04-27 2023-05-04 The University Of Hong Kong Use of hcn inhibitors for treatment of cancer
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US8513410B2 (en) 2011-12-20 2013-08-20 Les Laboratoires Servier Process for the synthesis of ivabradine and addition salts thereof with a pharmaceutically acceptable acid
TWI511957B (zh) * 2013-03-26 2015-12-11 Servier Lab 合成７，８－二甲氧基－１，３－二氫－２ｈ－３－苯氮呯－２－酮化合物之方法及其於依伐布雷定（ｉｖａｂｒａｄｉｎｅ）之合成中之應用
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